Improving Air Flow in Roof A/C vents.

JWRoberts wrote:
Thanks for all the detailed photos and details. Mine is in the shop now because of poor cooling.

You're welcome.

Paul D. wrote:
Please update us on how booster fans work out as your testing progresses.

They just arrived and I will update.

mudmaker wrote:
I'm gonna go out and check a few things on mine now. Thanks.

mudmaker wrote:
Hey I discovered mine has the same leaky areas. Guess I'll do a little taping in the morning.

Hope this helped.

wrgrs50s wrote:
Thanks for posting with pictures !! Your info is very helpful for many of us who have been looking for tips on our AC units. Looking forward to updates.

You're are welcome and I will update with any new info I find.

profdant139 wrote:
Well done! I really like the use of the Kestrel to measure air flow -- very creative.

It's all I had but it at least shows me where I am making improvements to my situation.

93Cobra2771 wrote:
I had already done the sealing and such but haven't had time to study at improving efficiency very much. Your homework is saving me from doing the same homework. :-)

Will be watching this for sure.

I hope this helps you out. Just trying to show there is room for improvement, but it may trial and error.

BarneyS wrote:
Excellent post! Welcome to the forums! :) Hope you post often and get a lot of enjoyment out of this site.

What make/model of air conditioner is that?
Barney

Thank you. I don't know what a/c I have but will look at my paperwork and let you know.

Chris Bryant wrote:
Very nice job- though I would not really recommend the booster blowers- rather look closely at the duct work itself, make sure the ends are capped off past the last register and note how the registers are sealed.

I am surprised the vane under the outlet didn't help more.

Yep, even though the air can't go anywhere past the last registers, it is less air that the a/c has to cool. I did verify that the ducts end at the last vent forward/aft.

smthbros wrote:
While I applaud your tenacity in improving the airflow from your AC, I recommend you measure the volume of air flowing (cfm) rather than velocity (mph). When putting a thumb over the end of a garden hose, the velocity of water is increased, however the volume is decreased. CFM is what counts. Also, when turning air thru a duct, the inside radius of the bend is what is critical. Inside radius should be at least half the duct height. Not easy to do in most rv duct systems.

Unfortunately my cfm-o-meter is in the shop. I was just trying to have a record of any improvements in air flow. MPH was tested at the same location on each vent for each test. Therefore the tests were accurate in showing an improvement in air flow. Before, I couldn't hardly feel the air exiting some of the vents… now I can.